Sewed signature.



Patented Apr. 8, I902.

w. (1. TREVETTE. SEWED SIGNATURE.

(Application filed May 24; 1900.)

( '10 Muda'l.)

'FLEL WI g 5 5 E s Uniirnn STATES *PATENT OFFICE.

YVENTWORTII G. TREVETTE, OF CHICAGO, ILLINOIS, ASSIGNOR, BY DIRECT AND MESNE ASSIGNMENTS, TO TREVETTE MACHINE COMPANY, OF CHI- CAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

SEWED SIGNATURE.

SPECIFICATION forming part of Letters Patent No. 697,043, dated April 8, 1902. Application filed May 24, 1900. Serial No. 17,877. (No model.)

To all whom/ it Duty concern.-

Be it known that I, WENrwoRrH G. TRE- VETTE, a citizen of the United States, residing at 43 Montauk Building, Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Sewed Signatures, of which the following is a specification.

My invention relates to improvements in sewed signatures, and has for its primary object the production of a series of signatures sewed together in such a manner that while the signatures are securely united to each other the stitches between any two adjacent signatures may be severed, so as to separate such signatures from one another,without unraveling or disconnecting the remaining signatures, which result is best attained by the use of a certain novel stitch invented by me, the formation and use of which stitch is hereinafter fully described.

The machine described and illustrated in United States Letters Patent No. 671,530, granted April 9, 1901, upon my application Serial No. 7,314, is capable of forming my improved stitch, although it undoubtedly may be produced by other machines when myimproved stitch is fully understood.

The steps by which my new stitch may be formed are clearly illustrated in the accompanying drawings, in which- Figures 1, 2, 3, and 4E show in detail the steps and order of steps in which the threads are manipulated in sewing signatures together by my new stitch, which steps and their order will be described in detail farther on. Fig. 5 shows an enlarged detail view of the completed knot, and Fig. 6 shows a number of signatures stitched together by my new stitch.

Similar letters of reference indicate the same parts in the several figures of the drawings.

In forming my new stitch two separate threads are employed, and while I have shown in the machine of my before-mentioned application two semicircular needles mounted upon a common axis and working in opposite directions for sewing signatures together with this new stitch I do not desire to be limited to this particular form of machine.

Referring by letter to the accompanying drawings, A indicates one thread, and B the other, both of which retain their general positions from their point of feed with relation to the signatures throughout the operation, the various loops formed therein being carried to the appropriate points by the needles to produce the knot. The stitch may be properly called a lock-stitch, because when the knot is formed the threads may be cut on either side of it that connect adjacent signatures together without any danger of unraveling.

Holes are preferably first punched or out in the backs of the signatures where the thread is to be passed through them, and a loop ais first formed in one of the threads-say the thread Bby passing it doubled through one of the holes in the signature-say the hole C-in the signature 1 (see Fig. 6) from the outside, and out of the adjacent hole D in the same signature from the inside, thus bringing the parts to the position shown in Fig. 1. A loop I) is next formed in the other thread A and passed through the loop .7 5 Ct in the thread B to a point surrounding the hole E in the next signature 2, thus drawing the threads in the position shown in Fig. 2. A second loop 0 is then formed in the threadA and passed through the loop I), previously formed in the same thread, as shown in Fig. 3. This loop 0 is then passed down through the hole E in signature 2 from the outside and up through the hole F in signature 2 at the 0pposite side, where the operation is repeated, excepting that the loops 1) and c are now formed in the thread B interlocking with the loop 0, when after the completion of a knot on that line a loop in the thread B is again brought back to the original line by passing go it down through the hole G in the back of the signature 3 and out through the hole H in the back of the same signature, and so on the operation can be repeated indefinitely.

In Fig. 4the completed knot is illustrated, the dotted lines (Z showing the loop extending to the loop b, formed in the thread B and about to pass through the loop 0 in the thread A on the outside of the back of the signature 2.

Of course in performing these various operations the tension operates to take up the proper slack, so as to draw the loop 19 down tight, and thus form a perfect knot at the back of the signature, the tension of course being regulated according to the timing of the various operations and the tightness with which the knots are desired to be drawn.

Although in the drawings the knots are all shown loose, Figs. 4, 5, and 6 show the general slack of the various loops as taken up, so as to show the knots in proper formation; but these figures do not show the knots tightened, as they must necessarily be in actual work.

Having thus fully described my invention, what I claim, and desire to secure by Letters Patent, is-

l. A book comprising a plurality of signatures connected at the back thereof by two threads and two lines of stitching, said threads being knotted together at one point between each pair of signatures, and alternately on each line of stitching, substantially as described.

2. A plurality of signatures attached together at their back edges by a plurality of threads on a plurality of lines of stitching, said threads being knotted together alternately on each line of stitching, the knots between each pair of signatures being arranged so as to offset the knots between the next adjoining pair of signatures, substantially as described.

3. A plurality of signatures sewed together by alternating knotted and unknotted stitches, the knots connecting each pair of signatures being so located as to offset knots connecting the next adjoining pairs of signatures, substantially as described.

4. A series of signatures secured together by a stitching comprising a plurality of threads knotted together between every alternate pair of signatures and along one line of stitching and knotted together between intervening pairs of signatures on the next line of stitch ing and so on repeatedly, whereby each pair of signatures is held together bya series of 5c knotted and unknotted threads, the knots of adjoining series offsetting each other, substantially as shown and described.

5. A series of signatures secured together by stitching consisting of a loop of one thread passed inwardly through the back of one signature and outwardly through the back of the same signature at another point, a loop of a second thread knotted with the first loop at that point and passed inwardly through the back of the next signature and outwardly through that back at another place, and then knotted with a second loop of the first thread and so on repeatedly whereby there are knots between every alternate pair of signatures offsetting knots between intervening pairs of signatures, substantially as shown and described.

6. Aseries of signatures secured together by stitching, consisting of a loop of one thread passinginward through the back of one signature and outward through the back of the same signature at another point, a loop of another thread passing through the end of the first-mentioned loop outside of the signature, a second loop in the second thread passing through the first loop in the second thread and inwardly through the back of the next signature and outwardly through its back at another place, and another loop of the first thread passing through the last loop of the second thread and a second loop in the first thread passing through the partly-formed loop in said thread and through the back of the signature and so on repeatedly, substantially as shown and described.

WENTWORTH G. TREVETTE.

Witnesses:

O. L. WooD, F. H. DRURY. 

